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Old 01-02-2008, 07:07 PM
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305 build up.

before i even start posting this i already know you're all going to say throw the engine overboard in a lake, i know i know a 350 is better, yada yada... but i want to build my 305 that i got for free.

i was wondering if any of you could tell me how this combination of parts will fare?

1984 305

top end:

summit racing dual plane mani
350 alum heads 64cc 190cc runner, 2.02&1.60 valves.
1.5 roller rockers (any thoughts on 1.6)
also any idea what size pushrods? if i could get a number that would be so much better than taking the time to measure.

compcams 286H cam 490/490-DUR @ .050 236/236

OR

melling "327/350hp" Class II street performer cam #22203 - specs 214/224 at .050 - 288/298 advertised duration - 443/465 lift - 107/117 centerline (112)

i can't decide on cams either. i want a bad *** idle sound, but enough vacuum so that i can actually run power steering and my brakes.

bottom:


Federal Mogul Hypereutectic pistons - flat top H534CP coated (either stock or .30 over can't decide)

Moly Perfect Circle rings to match pistons 41137CP

High volume Melling M55HV oil pump

Steel oil pump drive shaft IS55E

Fel Pro full gasket set 260-1023 (KS2619)

Cloyes double roller timing set C3023XSP (3-key skin packed)

Clevite 77 main bearings MS909P any size

Clevite 77 rod bearings 8-CB663P any size

Clevite cam bearings SH290S

16 - B0817 hydraulic flat tappet lifters

PE100B brass freeze plug kit

EAGLE nodular cast 3.480" stroke crankshaft - 103503480

EAGLE SIR rods - press fit - SIR5700BPLW forged with ARP bolts

any thoughts even brutally vicious attacks would be appreciated.

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Old 01-02-2008, 07:26 PM
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That parts combination and a 600 carb will make a nice driver motor.

I see you listed a new crankshaft and rods...any thoughts about purchasing a stroker kit for it? It would cost the same and that would be pretty different.

I think that you would lose vacuum with 1.6 rockers

I like comp cams and the first one would be better.

To really know how this would perform you should download the free trial version of Engine Analyzer Pro V3.5 at www.performancetrends.com and play with the different combos for awhile.

Here is the other thing...if you are really disappointed with the performance you can always use all the parts except piston crank and rods to build any other small block chevy.

Good Luck
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Old 01-02-2008, 07:35 PM
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So what part of that is the free part?
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Old 01-02-2008, 07:41 PM
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There should be a link to download the whole program and use it free for ten days try this link and just click your operating system

http://www.performancetrends.com/download.htm#eapro
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Old 01-02-2008, 08:13 PM
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305 build.

First of all, before you do or buy anything, tear the motor down, and find out what sort of shape it's in. If they're good, have the crank and rods redone. Bore the block only as much as needed to clean it up. Because the 305 has so much "bad press", you can probably find as good a piston, and cheaper, than the ones you've listed. That's wayyyy toooo much cam! Call whatever cam grinder you decide to go with, and ask their tech people what's best, and FOLLOW it. Also, you're too big on the valve sizes; first you don't need them, and second, they most likely won't clear the 305's bore anyway. 350 heads will also drop your compression some. Listen to Firebird88 on this site about what you need to do to 305 heads to really wake them up. 180 degree style intake is right on, but don't go overboard on a carburator. HEI distributor with a recurve. Forget about other than stock push rods and rocker arms. Balancing: I say if it's essentially just a stock short block with a cam change then, NO; if you swap out the crank, or rods, or switch to other than a stock replacement type piston , then you will have to have the rotating assembly balanced. That's what I'd do.
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Old 01-02-2008, 08:25 PM
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190cc runner heads on a 305? can you say no low end power what`s so ever? 2.02 valves are asking to smack the cylinder wall. This is why world carry`s heads that are designed for small bore engines like the 305.
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Old 01-02-2008, 08:44 PM
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so they'll hit the side wall? what if i bored it out the max it will go? i already bought the 350 heads, and i got the 305 for free. what do you think max bore would be safe at? 335? damnit, lol i bought these heads thinking they will clear. hm... what cam size do you recommend then? and i'm already running desktop dyno? and it says this combo will produce:

RPM TQ HP
2000 313 119
3000 298 170
4000 321 244
5000 353 337
6000 356 407

idk i figured you guys would know better from personal experience not a computer program.
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Old 01-02-2008, 11:10 PM
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those heads are a big no-no. 2.02 + 1.6 + .150 = 3.77" stock bore on a 305 is 3.736" besides the fact that the valves are too big, the chambers are prolly too big as well. to have any kind of decent compression, youll need a head with a 60cc volume, 170cc runners. stock 601s or 416s with some port match and bowl blending will be your best bet, unless you wanna buy the World Torquer S/R heads which are made specifically for the 305. you dont want to bore it any more than .060 and even that is pushing it on hitting a water jacket or even overheating.

the Comp cam is a bit too big as well. camming a 305 is a fine balance between too much and not enough. when looking at cams for your 305, keep in mind that the 305 wont start breathing until the valves obtain .440" of lift, with the max being around .460". id settle for the Melling cam.

you can run a stock Quadrajet 750CFM, even though everyone will say its too big of a carb for a 305.

here is my combination:

1979 305:
- .040 over with dish top pistons
- Lunati Bracketmaster II 00016 cam (218/218, .458/.458)
- Mr Gasket .028" head gaskets
- Edelbrock dual plane intake
- Dynomax headers
- 601 heads 1.94, 1.5. port matched
- 750cfm Quadrajet
- true dual exhaust

last dyno put 208hp/270tq to the wheels with rear gears being my limiting factor. i also have all emissions provisions in operating order (EGR, and thermal vacuum switches). this is installed in a 1979 Malibu.
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Old 01-03-2008, 05:07 AM
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Quote:
Originally Posted by DHMag
you can run a stock Quadrajet 750CFM, even though everyone will say its too big of a carb for a 305.
Only the people that call them QuadraJunks and QuadraBogs.........

If you want a race motor find a 350 to build, if you want a nice cruiser motor that will give decent street performance, decent mileage and have a nice exhaust note using your freebie take a good look at DHMag's combo. A friend had one very similar in a '79 Malibu with a TH350 and 3.08 posi and it was a real blast to drive, it could do some pretty good burnouts. Yeah there were faster cars but they also used a lot more gas and required more maintenance.
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Old 01-03-2008, 06:43 AM
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I had the Edelbrock Performer on my 305, 1.6:1 Harland Sharp rockers plus this cam, which gives great low end torque, it now lives in my 350.



A 305 usually has 58cc chambers, with 64s you´ll lose compression.
I bought the World Products S/R Torquers for mine, they too now live on my 350, 10.0:1 comp.
305´s don´t take much boring the walls are too thin.

Last edited by malc; 01-03-2008 at 06:50 AM.
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Old 01-03-2008, 09:14 AM
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Since your planing on stroking it why not just try to find a 350 block,and build a 383. The stroker kits are about the same price,Speedway motors has good deals on rotating assemblys
Shane
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Old 01-03-2008, 09:41 AM
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Is it really worth it for 312 cu inches ?
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Old 01-03-2008, 09:44 AM
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well the kit that i was getting with all those bottom end parts said that with a 64cc chamber compression was 9:1. so if i bored it out to .60 over, and kept that melling cam you don't think it would work? i know the 190cc's are too big but what effect will that have? no bottom end? also the stock pushrods and rockers will work fine with that cam? and i know real power is with a 350, but this thing was free. and apparently not that many people build them. and now comes the part where you're all really going to crucify me. i'm hybriding it. i'm taking the 305 and putting it into a 1990 240sx using hugger headers to a Y-pipe to a 3inch exhaust (no cat). because no only is it rear wheel drive, but even with an all cast 350 in it it still weighs less than a corvette. and without the motor it weighs about 1700lbs. the rear gears are 4.08 though so idk. the make VLSD infiniti q45's that uses a 3.69 and bolts right up. (i know the 84 camaro's was 3.73) hahaha i'm just waiting for the death threats now.
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Old 01-03-2008, 10:18 AM
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305s can be decent (I have one in my truck .020 over l69 ho 9.8 compression performer eps intake 600 cfm carb heads look ported headers dauls no cats{<factory} homemade chambered mufflers) It runs real good for a 305 (next engine will probabally be a 350 383 400 or maybe a ls series engine)but a 350 with those mods would make better power and probabally better gas milage.
Why not look for a 350 block then sell your 305?

Economy Rotating Assembly Kit
383 flat top
2 valve relief
5.7" rod
$369.99

Economy Rotating Assembly Kit
383 flat top
2 valve relief
6" rod
$459.99

http://www.speedwaymotors.com/p/3176...ssemblies.html

Shane
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Old 01-03-2008, 08:58 PM
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Quote:
Originally Posted by Hippie
Only the people that call them QuadraJunks and QuadraBogs.........

If you want a race motor find a 350 to build, if you want a nice cruiser motor that will give decent street performance, decent mileage and have a nice exhaust note using your freebie take a good look at DHMag's combo. A friend had one very similar in a '79 Malibu with a TH350 and 3.08 posi and it was a real blast to drive, it could do some pretty good burnouts. Yeah there were faster cars but they also used a lot more gas and required more maintenance.

btw, those dyno numbers were from when i was running an 800CFM Quadrajet, and my mileage was 15 city/24 highway.
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